# For a random variable X. If E(X) = 5 and V(X) = 6, then E(X^{2}) is equal to?

**Solution: **

Variance (**σ**^{2}) is the squared variation of values (**X _{i}**) of a random variable (

**X**) from its mean (

**μ**) .

The variance formula lets us measure this spread from the mean of the random variable.

The variance formula is different for a population and a sample.

Given that:

E(X) = 5 and V(X) = 6

We have:

V(X) = E(X^{2}) - [E(X)]^{2}

6 = E(X^{2}) - 5^{2}

E(X^{2}) = 6 + 25

= 31

## For a random variable X. If E(X) = 5 and V(X) = 6, then E(X^{2}) is equal to?

**Summary:**

For a random variable X., If E(X) = 5 and V(X)=6, then E(X^{2}) is equal to 31. Variance (σ^{2}) is the squared variation of values (X_{i}) of a random variable (X) from its mean (μ) .

Math worksheets and

visual curriculum

visual curriculum